From 7c1ff5ecd59129a1ea63251c76022b9f9d64c858 Mon Sep 17 00:00:00 2001 From: Chris Palmer Date: Wed, 21 Aug 2019 11:36:48 +0100 Subject: [PATCH] Added comment to belts about using negative pitch radius for outside pulleys. --- readme.md | 2 ++ vitamins/belt.scad | 2 ++ 2 files changed, 4 insertions(+) diff --git a/readme.md b/readme.md index 8976a4a..b635939 100644 --- a/readme.md +++ b/readme.md @@ -165,6 +165,8 @@ exposing enough information to make a battery box. Models timing belt running over toothed or smooth pulleys and calculates an accurate length. Only models 2D paths, so not core XY! +To make the back of the belt run against a smooth pulley on the outside of the loop specify a negative pitch radius. + By default the path is a closed loop but a gap length and position can be specified to make open loops. Individual teeth are not drawn, instead they are represented by a lighter colour. diff --git a/vitamins/belt.scad b/vitamins/belt.scad index 37ad1d5..48b9da5 100644 --- a/vitamins/belt.scad +++ b/vitamins/belt.scad @@ -21,6 +21,8 @@ //! Models timing belt running over toothed or smooth pulleys and calculates an accurate length. //! Only models 2D paths, so not core XY! //! +//! To make the back of the belt run against a smooth pulley on the outside of the loop specify a negative pitch radius. +//! //! By default the path is a closed loop but a gap length and position can be specified to make open loops. //! //! Individual teeth are not drawn, instead they are represented by a lighter colour.